[Haskell-cafe] data.binary get reading beyond end of input bytestring?

[Conrad Parker]

On 29 July 2010 17:46, Duncan Coutts <duncan.coutts at googlemail.com> wrote:
> On 29 July 2010 07:53, Conrad Parker <conrad at metadecks.org> wrote:
>
>>> Something smells fishy here. I have a hard time believing that binary is
>>> reading more input than is available? Could you post more code please?
>>
>> The issue seems to just be the return value for "bytes consumed" from
>> getLazyByteString. Here's a small example.
>
> http://hackage.haskell.org/packages/archive/binary/0.5.0.2/doc/html/Data-Binary-Get.html#v%3AgetLazyByteString
>
> getLazyByteString :: Int64 -> Get ByteString
> An efficient get method for lazy ByteStrings. Does not fail if fewer
> than n bytes are left in the input.
>
>
> Because it does it lazily it cannot check if it's gone past the end of
> the input. Arguably this is crazy and the function should not exist.

cheers Duncan, that confirms my guess about the reason. Would you
accept a patch quoting you on that last point to the comment? ;-)

Conrad.